Improvement in hot-air furnaces



ISAAC T. WINCHESTER, OF BOSTN, MASSACHUSETTS.

' Letters .Patent No. 87,610, dated March 9, 1869.

e IMPROVEMENT IN HOT-AIR FURNACES.

.-ll o The Schedule referred to in these Letters Patent and making part the same.

To all whom it ma/y concern i Beit known that I, ISAAC T; Wrncnnsrnn, of Boston, in the county of Suffolk, and State of Massachusetts, have invented certain Improvements in Hot-Air Furnaces, of which the following is a full, clear, and exact description, reference being had to the accompzltlnylilng drawings, making part of this specification, in w 1c vFigure l is a perspective view of my improved furnace, the brick-work by which it is to be surrounded not being represented.

' Figure 2 is a vertical section through the centre `of the same. f Fgure 3 is a horizontal section .on the line :t :c of

Figure ltis a vertical section on the line y y of iig. l.

My invention consists in a series of independent tubes passing through and forming thefsides of the re-pot, the cold air entering -at the bottomv of these tubes, and, when heated, passing into the hotair chamber above,

` thus greatly increasing the amount of radiating-surface,

ang, consequently, the heating-capacity of the furnace; an

My invention also consists in constructing the top of' the furnace in the form of an inverted frustumof a cone, or of such other form as will canse the heated products of combustion to be deflected against, and adding to the heat of the upper ends'of the tubes passing through and forming the sides of the fire-pot, this peculiar form of the top giving a `constantly-increasin g area of radi. ating-surface, as it approaches the hot-air chamber above; and p u Y My invention also consists in an adjustable smokepipe, so fitted to the lowest portion ofthe top of the furnace, that it may be turned around in any direction, according to the position of the iue it is to enter, the pipe, by its close prximity'to the iire, receiving an'd imparting additional heat; and, furthermore, R My invention consists `in a box or trunk, placed over the upper ends of two or more of the tubes forming the sides ofthe fire-pot, in order to receive and concentrate ythe currents of hotair passing up these tubes, a single tube leading from the Vsaid box or trunk to an apartment remote from the furnace, by which construction the whole of the hot air accumulated within the box is forcibly driven to the desired point.

To enable others skilled in the art to understand anduse my invention, I will proceed to describe the manner in which I have carried it out.

In the said drawings, A represents the exterior casing of the furnace, which is to be enclosed within suitable briclr-work, as represented by red lines, figs. 1, 2, and 3, 'in the ordinary manner.

Within this casing A, and extending partially around it, is arranged a series of independent tubes, B, the' lower ends of whichpass through a plate, a, and open into the bottom of a chamber, C, between the casing A and the brick-work surrounding it, while the upper ends of these tubes pass through a plate, b, and open into the upper portion of the chamber C (containing hot air) above, which supplies the several pipes leading to the apartments to be warmed.

These tubes pass vertically up through. and form the sides of the fire-pot, excepting at its front, where the coal is admitted, a -suiiicient space being left between the tubes to allow of the free circulation of air around them, to prevent their being destroyed by the heatn The air admitted by the cold-air box into the lower portion of the chamber G, passes up, through the tubes B, to the upper portion of the chamber C, the currents of air being heated in their upward passage through these tubes, the contact of the fire therewith serving to intensify the heat to a great degree. D is the ash-pit, of smaller diameter than the casing A, to admit of the lower ends of the tubes B communicating with the lower portion'of the chamber C.

verted frustum of a cone, (see g. 2,) in order that the 4heated products of combustion, as they impinge thereon, may be deflected against the upper ends of the tubes B, whereby the air passing through them is heated presenting a constantly-increasing area of radiatingsurface, as it rises toward the hot-air portion of 'the chamber C.

It is evident, that instead of making the topVE, of the furnace of the form as above described, its sides c may be slightly curved inward or outward, without departing from the spirit of my invention.

G is a smoke-pipe, which fits over a collar or ange, d, passing up from the centre of the top, E, of the furnace.

This smoke-pipe is not rigidly connected with the furnace, but is free to be turned upon the collar d, as a centre, to any direction toward the flue which it is to enter, thus avoiding the inconvenience and expense of forming elbows, incident to the old construction, where the smoke-pipe projects out from the side at axed point, the lower portion of the pipe, by being in close proximity to the fire, also affording more heating and radiating-surface.

culty has been experienced in heating apartments'A situated at one side of and at a distance from the furnace, owing to absence of any provisign for concentrating the currents of hot air to the points desired.

Instead of allowing all of the hot air to passup into the hot-air chamber, or upper portion of the chamber or trunk H, (see flgs. l and 4,) the top of which is pro-l vided with a single opening, c, to which is fitted a pipe, leading to the apartment heretofore difficult to be heated.

By the construction above enumerated, several currents of hot air are united within the trunk H, and are forcibly driven,I through its contracted outlet, up into 'lhe top, E, of the furnace is of the form of an into a greater degree, the form of the top of the furnace In'furnaces as heretofore constructed, a great dfv 0, I enclose the tops of two or more tubes Within a box,

and forming the sides of the re-pot of o furnace, as und for the purpose set forth.-

Also, the adjustable smoke-pipe G, in combination With the top, E, of a furnace, to the lowest; portion of which it is fitted, and upon which it turns as a centre, substantially as :md for thekpnrpose described.

Also, the box, or trunk H, in combination with two o1' more tubes, B, as und for the purpose set forth.

ISAAC T. WNGHESTER.

Witnesses v N. W'. STEARNS, W. J. CAMBRIDGE. 

